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Looking for valve spring recommendations #2906037 04/04/21 09:57 AM 04/04/21 09:57 AM
Joined: Jan 2014 Posts: 142 Vermont B bracketcharger OP member
bracketcharger OP member B Joined: Jan 2014 Posts: 142 Vermont	I'm hoping to get some recommendations for valve springs. Engine is a 440 with Mopar performance 292 .509 cam, 3/8 pushrods, Hughes 1.6 rocker arms. Heads are #452 cast iron, ported and flow 276 at .540 lift. Valve guides have been cut for PC valve seats so plenty of clearance for this lift. I presently have a set of fresh Comp 911-16 springs. With the Comp springs I have plenty of room before coil bind comes into play. Wondering if the higher ratio rocker arms will require a stiffer spring. Thanks in advance for any assistance. Happy Easter

Re: Looking for valve spring recommendations [Re: bracketcharger] #2906072 04/04/21 10:23 AM 04/04/21 10:23 AM
Joined: May 2005 Posts: 1,990 Apollo, PA. B1MAXX top fuel
B1MAXX top fuel Joined: May 2005 Posts: 1,990 Apollo, PA.	Sounds ok to me. I would think that's plenty of spring for that combo. 122 on the seat @1.900 and 320 over the nose.

Re: Looking for valve spring recommendations [Re: B1MAXX] #2906188 04/04/21 12:23 PM 04/04/21 12:23 PM
Joined: Jan 2014 Posts: 142 Vermont B bracketcharger OP member
bracketcharger OP member B Joined: Jan 2014 Posts: 142 Vermont	Thanks B1MAXX I guess I was just over thinking it. Cheers !

Re: Looking for valve spring recommendations [Re: bracketcharger] #2906227 04/04/21 12:59 PM 04/04/21 12:59 PM
Joined: Aug 2003 Posts: 43,195 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,195 Bend,OR USA	Never trust the specs. furnish with the springs with no way to verify the actual pressures Take them to a shop with a good valve spring tester and have them set your springs up while verifying the pressures, I like to see 140 to 160 lbs. on the seats and from 325 to 375 lbs. at max lift with at least .060 from coil bind on all 16 springs You need to use a set, pair of, checking springs to get the actual lift at the valves first before setting the springs up so you know the true max lift with your rocker arms also Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Looking for valve spring recommendations [Re: Cab_Burge] #2906263 04/04/21 01:32 PM 04/04/21 01:32 PM
Joined: May 2005 Posts: 1,990 Apollo, PA. B1MAXX top fuel
B1MAXX top fuel Joined: May 2005 Posts: 1,990 Apollo, PA.	Originally Posted by Cab_Burge Never trust the specs. furnish with the springs with no way to verify the actual pressures Take them to a shop with a good valve spring tester and have them set your springs up while verifying the pressures, I like to see 140 to 160 lbs. on the seats and from 325 to 375 lbs. at max lift with at least .060 from coil bind on all 16 springs You need to use a set, pair of, checking springs to get the actual lift at the valves first before setting the springs up so you know the true max lift with your rocker arms also On a hydralic flat tappet?

Re: Looking for valve spring recommendations [Re: bracketcharger] #2906369 04/04/21 04:59 PM 04/04/21 04:59 PM
Joined: Oct 2007 Posts: 4,206 New York polyspheric master
polyspheric master Joined: Oct 2007 Posts: 4,206 New York	The higher ratio increases the spring load on the valve by the change proportion. A spring using 1.6:1 will increase the open load by 6.7% (1.6 ÷ 1.5), a 500 lb. spring becomes 533. The closed load won't change. The 1.6:1 rocker will also increase the load on the tappet & lobe in the same proportion. The 500 lb. spring was 750 lbs. with the 1.5:1 rocker, becomes 800 lbs with the 1.6:1. Boffin Emeritus

Re: Looking for valve spring recommendations [Re: B1MAXX] #2906391 04/04/21 06:01 PM 04/04/21 06:01 PM
Joined: Aug 2003 Posts: 43,195 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,195 Bend,OR USA	Originally Posted by B1MAXX Originally Posted by Cab_Burge Never trust the specs. furnish with the springs with no way to verify the actual pressures Take them to a shop with a good valve spring tester and have them set your springs up while verifying the pressures, I like to see 140 to 160 lbs. on the seats and from 325 to 375 lbs. at max lift with at least .060 from coil bind on all 16 springs You need to use a set, pair of, checking springs to get the actual lift at the valves first before setting the springs up so you know the true max lift with your rocker arms also On a hydralic flat tappet? Absolutely on Mopar V8 with stock .904 lifters Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Looking for valve spring recommendations [Re: Cab_Burge] #2906543 04/04/21 08:42 PM 04/04/21 08:42 PM
Joined: May 2005 Posts: 1,990 Apollo, PA. B1MAXX top fuel
B1MAXX top fuel Joined: May 2005 Posts: 1,990 Apollo, PA.	Originally Posted by Cab_Burge Originally Posted by B1MAXX Originally Posted by Cab_Burge Never trust the specs. furnish with the springs with no way to verify the actual pressures Take them to a shop with a good valve spring tester and have them set your springs up while verifying the pressures, I like to see 140 to 160 lbs. on the seats and from 325 to 375 lbs. at max lift with at least .060 from coil bind on all 16 springs You need to use a set, pair of, checking springs to get the actual lift at the valves first before setting the springs up so you know the true max lift with your rocker arms also On a hydralic flat tappet? Absolutely on Mopar V8 with stock .904 lifters mopar recommened the P3690933 spring with that cam it was 115 on the seat, and 310 over the nose. But hey ok.

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